Mr McGowan triggered the stoush during that visit, telling Mr Turnbull to "stop acting like Tony Abbott", while the Prime Minister told him to "put some steel in his spine".

While the media happily lapped up the juicy sound bites, the ongoing political point scoring was anything but good news for WA voters, long since weary of the GST debate and perpetual impasse that saw their state short-changed.

Mr Turnbull even appeared to bristle at an ABC reporter's suggestion that West Australians were angry with him and his Government over the state's shortfall in GST payments.

"I have met with hundreds of West Australians this week … and the reception I have had could not have been warmer, or more positive, or more welcoming," Mr Turnbull said last August.

"It is a complete parallel universe between what the media is saying and what the people I am meeting in the real world are saying to me."

In stark contrast, his own WA-based colleagues were at the same time privately and publicly lamenting the fact the GST issue was a festering sore with WA voters.

WA's federal Liberals were well aware there was widespread and growing voter anger over the issue which, if not fixed ahead of the next election, would likely see a number of them, including ministers, turfed from office.

The announcement was warmly welcomed by not only federal Liberal MPs but also the McGowan Government, with WA Treasurer Ben Wyatt describing it as "a solution and a genuine GST reform" that could be achieved.

The campaign is underway

Fast forward to this week and the scenes were a far cry from the argy bargy of the Prime Minister's visit last August.

With the Federal election now expected to take place in the first half of next year, the Liberals have turned their focus to ensuring that the poll becomes a referendum on the GST in WA.

The campaign might not be officially underway but make no mistake, it has begun in earnest.

"We'll be calling on West Australians to vote for the Liberal Party because they know they can trust my Government to deliver a fair deal on the GST," Mr Turnbull said on Thursday.

"You can't trust Bill Shorten on the GST or anything else."

For what it's worth, Mr Shorten backs a 75 cent floor, but has called for it to be legislated.

The Federal Government's preference is for all of the states to sign off on the GST proposal by the end of the year.

But Federal Treasurer Scott Morrison has said the fix can be implemented regardless of whether an agreement is reached with all states.

The Prime Minister says West Australians know they can trust him to deliver a fairer deal for WA on the GST, but it is more likely they will not be completely at ease until the money starts flowing into the state's coffers.

While West Australians may be sceptical, they are no doubt glad they don't have to spend another week watching Mr Turnbull and Mr McGowan embroiled in a slanging match over a problem that has dragged on for far too long.